Aja Kona LH After Effects preview problem

Hi there,

We just bought our first AJA Kona LH cards to replace the Decklink boards in our Macs and now we are looking at a strange playback problem with After Effects preview on a broadcast monitor.

With the Decklink card everything was fine, but the Kona does not seem to be able to output a constant 25 fps on the broadcast monitor (we are working in a PAL environment). It seems to be going slower and faster (most of the time slower than 25 fps).

The preview output settings are set 625/25i and the funny thing is, the "mirror" preview on the mac's screen is stutter free and looks absolutely perfect.

Did I miss a special setting in After Effects or in Kona's control panel?

I would be glad if you could help me out with a solution.

Cheers,
Robert